- The cleaning abilities of the new dish liquid are truely incredible
(by Meister Proper)

- schalla lalla la
(by o o o )

- You can almost hear the crashing of the waves.
(by Philonious)

- The design craze finally reached capital punishment

Acoustic Mirror

This image shows a device called "Schallspiegel" [acoustic mirror] which was designed to demonstrate acoustic reflections. The experimental setting, as shown above, was part of a larger exposition in the late 19th century at the Urania in Berlin. This location played a decisive role in the beginning movement of the popularisation of science, which found its expression in a growing interest in experiment kits for the public as well.